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A. ROWE. STEAM GENERATOR.

No." 67,589. Patented Aug. 6, 1-867.

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' ABRAM ROWE, or MACOMB, ILLINOIS, ussreson TO HIMSELF, CHARLES CHANDLER, AND JAMES DUNCAN, OF SAME'PLAGE.

Letters Patent No. 67,589, dated August 6, 1867.

IMPROVEMENT IN STEAM-GENERATORS.

TO ALL WHOM IT MAY concerns:

Be it known that I, ABR'AM Rows, of Macomb', in the county of McDonough, and State of Illinois, have ipvented certain new and useful Improvements in Steam-Boilers; an d' Ifdghereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification, and to the letters of reference marked'thereon, like letters indicating like parts wherever they occur.

To enable others skilled in the art to construct and use my invention, I will proceedto describe it,

My invention consists in constructing a boiler, for generatingsteam, of a series of annular water-chambers, arranged concentrically one within another, with spaces for the heat. to pass between them,.and all opening direct into one common steam-chamber or reservoir.

Figure 1 is an elevation of a vertical boiler made on my plan, with a portion broken away to exhibit the I interior. Figure 2 is a top plan view of the same, with aportion broken away.

I construct a series of boilers or water-chambers, c, increasing in size from smallest to largest, in regular gradation, so as to form, when placed onewithin another, a'regular series of concentric water-spaces, as represented in the drawings. .lhesc chambers are made slightly conical, being smallest at their upper end, as shown in fig. 1, and are arranged within a shell or outer case, A, which extends far enough above the chambers to form a steam-chamber, C, at the top. The inner wall of-thc outer chamber e,-together with the shell A, slso extends far enough below the bottom of the chambers e to form a furnace-or fire-chamber, F, as shown in fig. 1, in which 0 represents the grate-bars, and d the furnace-door. By this arrangement it will be seen that the fire is surrounded by a water-chamber, which, together with each of the other chambers 0, opens directlyinto the steam-chamber C at the top, as shown in fig. 1; At the bottom one or more series of 't'ubesn co'nnects'the cham hers 0,56 that the water may pass readily from one ,to another ofthe'chambers; the tubes n being inclined downward, at their outer ends, for'the purpose of causing the sediment to flow outwardaud be deposited in the outer chamber 0, surrounding the furnace, from which it may be removed at the man-hole or opening m. when the series of chambers is thus arranged, there will be a central flue, B, passing from the furnace upward through the. interior of the inner boiler c,'which is elosed atthe top; the smoke passing through a lateral ,flue, a, as shown in fig. 1. There will also be an annular firc-space-or flue, 1), ,between each of the chambers a, each space or line 6 being connected to the adjoining flue by a lateral fine, a, which is made larger than the one immediately preceding it, for the purpose of conveying the smoke which enters it from its own flue b, and also that which enters threughthe preceding flue. There maybe two or more of these series of lateral lines a; all uniting outside of the boiler, in any desired manner, to form or enterthe smoke-stack or chimney.

By this manner of constructing a boiler a large amount of heating surface is secured, and the whole arranged in an exceedingly compact manner. The heat, as it ascends, will impinge against the inclined surfaces and be rapidly transmitted to the water, and, by making thewater-spaces a narrow, the water therein will be quickly heated, and thus generate steam with great rapidity,

It is obvious that horizontal boilers may be constructed on the same plan, by proriding'a steam-chamber above it, and connecting. each of the chambers c therewith, in which case the flues b may extend directly through and enter the smoke-stack at the opposite end,

Having thus described my invention, what I claim, is-- Asteamdmiler, consisting of a series of concentric chambcrs,ie, opening at their upper end direct into steam-chamber, and provided with the smoke-fines a, of a constantlyincreasing-area 'from the centre outward; said chamber! being connected by the lateral tubes or wates-passagct n, all constructed md'arrauged substantially asshown anddescribed. I ABRAM ROWE,

Witnesses:

N. O. Doves, I. T. Donor. 

